The original 4-plex (then “Plitt Foothills Cinemas”) presumably opened along with the Foothills mall in 1983. A new IMAX® theatre opened at the AMC Loews Foothills 15 on September 3, 2010.
http://www.txtmovieclub.com/profiles/blogs/tucson-new-imaxr-theatre-opens?xg_source=activity